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Previous issue date: 2011-06-21 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / A eutrofiza??o constitui-se na principal causa de perda de qualidade da ?gua dos a?udes da regi?o semi?rida brasileira. No entanto, ainda n?o existem estudos quantitativos sobre a import?ncia relativa de diferentes fontes de nutrientes para a eutrofiza??o dos a?udes como tamb?m n?o existem a??es efetivas de controle das cargas externas de nutrientes para esses mananciais. O presente estudo teve como objetivo estimar as emiss?es naturais e antr?picas potenciais de nitrog?nio (N) e f?sforo (P) para os sete maiores reservat?rios da bacia hidrogr?fica do Rio Serid?, na regi?o semi?rida do Rio Grande do Norte. Os resultados mostram que as emiss?es totais variam de 1955 t.N.ano-1 e 1180 t.P.ano-1 (Passagem das Tra?ras) a 84 t.N.ano-1 e 56 t.P.ano-1 (Carna?ba). As emiss?es antr?picas, em conjunto, s?o atualmente respons?veis por 72-87% de todas as emiss?es de nitrog?nio e mais de 98% de todas as emiss?es de f?sforo para os reservat?rios estudados. Dentre as emiss?es naturais, as emiss?es da deposi??o atmosf?rica s?o maiores para P e menores para N quando comparadas ?s emiss?es da denuda??o f?sica e qu?mica dos solos. Dentre as emiss?es antr?picas, as emiss?es de N e P oriundas da pecu?ria s?o maiores do que as emiss?es dos efluentes dom?sticos e da agricultura. Tais resultados dever?o subsidiar a??es de gest?o ambiental das bacias hidrogr?ficas e projetos de restaura??o de a?udes eutrofizados. / Eutrophication constitutes the main cause of water quality loss in reservoirs of Brazilian semiarid region. However, there are no quantitative studies about the relative importance of different nutrients sources for eutrophication of reservoirs as there are no control effective action to control the nutrients external loads to these reservoirs. The present study aimed to estimate the potential natural and anthropogenic emissions of nitrogen (N) and phosphorus (P) for the seven largest reservoirs of Serid? River watershed, in the Rio Grande do Norte semiarid region. The results show that the total emission range from 1955 t.N.ano-1 e 1180 t.P.ano-1 (Passagem das Tra?ras) a 84 t.N.ano-1 and 56 t.P.ano-1 (Carna?ba). The anthropogenic emissions are currently responsible for 72-87% of all nitrogen emissions and more than 98% of all phosphorus emissions to the reservoirs. Among the natural emissions, emissions from atmospheric deposition are higher for P and lower to N when compared to the physical and chemical soils denudation. Among the anthropogenic emissions, N and P emissions from husbandry are the larger than emissions from domestic sewage and agriculture. These results should support environmental management programs and watershed restoration projects of eutrophic reservoirs.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/22020 |
| Date | 21 June 2011 |
| Creators | Vasconcelos, Vitor Hugo Fernandes de |
| Contributors | 03130326707, Venticinque, Eduardo Martins, 07873068862, Lacerda, Luiz Drude de, 40076369749, Attayde, Jos? Luiz de |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM ECOLOGIA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | Portuguese |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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